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@johoelzl We now produce a better message for your example: inductive R : ℕ → Prop | pos : ∀p n, R (p + n) lemma R_id : ∀n, R n → R n | (.p + .n) (R.pos p n) := R.pos p n The new error is: file.lean:5:2: error: invalid function application in pattern, it cannot be reduced to a constructor (possible solution, mark term as inaccessible using '.( )') .p + .n
5 lines
122 B
Text
5 lines
122 B
Text
inductive R : ℕ → Prop
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| pos : ∀p n, R (p + n)
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lemma R_id : ∀n, R n → R n
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| (.p + .n) (R.pos p n) := R.pos p n
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